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Commitments and contingencies - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
spareEngine
helicopter
aircraft
engine
Dec. 31, 2017
USD ($)
Dec. 31, 2008
USD ($)
Jan. 31, 2024
aircraft
Jan. 31, 2024
USD ($)
Jan. 31, 2024
engine
Dec. 31, 1992
aircraft
engine
Loss Contingencies [Line Items]              
Purchase obligation, number of engines | engine 37            
Purchase obligation, number of helicopters | helicopter 8            
Non-refundable deposits $ 3,300,000,000            
Interest expense capitalized 130,000,000            
Subsequent event              
Loss Contingencies [Line Items]              
Number of managed aircrafts | aircraft       3      
Aircraft Hull and Spares and Equipment              
Loss Contingencies [Line Items]              
Insurance coverage claimable by entity 2,200,000,000            
Aviation, War and Allied Perils              
Loss Contingencies [Line Items]              
Insurance coverage claimable by entity 1,200,000,000            
C&P Policy | AerCap Ireland              
Loss Contingencies [Line Items]              
Insurance proceeds $ 1,300,000,000            
Russian Operator Reinsurance Claims | Subsequent event              
Loss Contingencies [Line Items]              
Insurance claim         $ 1,800,000,000    
Russian Federation              
Loss Contingencies [Line Items]              
Number of aircraft on lease | aircraft 67            
Number of engines on lease | spareEngine 10            
Russian Federation | Subsequent event              
Loss Contingencies [Line Items]              
Number of aircraft on lease | aircraft       113      
Number of engines on lease       6   23  
Russian Federation | Russian Operator Reinsurance Claims | Subsequent event              
Loss Contingencies [Line Items]              
Number of aircraft on lease | aircraft       46      
VASP litigation              
Loss Contingencies [Line Items]              
Loss contingency, loss in period   $ 0          
VASP litigation | VASP litigation English court              
Loss Contingencies [Line Items]              
Claim award for loss of profit plus accrued interest     $ 66,000,000        
Aircraft              
Loss Contingencies [Line Items]              
Number of forward orders | aircraft 338            
Aircraft | VASP litigation              
Loss Contingencies [Line Items]              
Number of aircraft on lease | aircraft             13
Number of leases that company incurred obligations due to another company's default | aircraft             13
Engines | VASP litigation              
Loss Contingencies [Line Items]              
Number of engines on lease | engine             3
Number of leases that company incurred obligations due to another company's default | engine             3